//package doc;
//
//import org.mapdb.DB;
//import org.mapdb.DBMaker;
//import org.mapdb.TxMaker;
//
//import java.util.Map;
//
//
//public class dbmaker_txmaker_basic {
//
//    public static void main(String[] args) {
//        TxMaker txMaker = DBMaker
//                .memoryDB()
//                .makeTxMaker();
//        //#a
//        DB tx0 = txMaker.makeTx();
//        Map map0 = tx0.treeMap("testMap");
//        map0.put(0,"zero");
//
//        DB tx1 = txMaker.makeTx();
//        Map map1 = tx1.treeMap("testMap");
//
//        DB tx2 = txMaker.makeTx();
//        Map map2 = tx1.treeMap("testMap");
//
//        map1.put(1,"one");
//        map2.put(2,"two");
//
//        //each map sees only its modifications,
//        //map1.keySet() contains [0,1]
//        //map2.keySet() contains [0,2]
//
//        //persist changes
//        tx1.commit();
//        tx2.commit();
//        // second commit fails  with write conflict, both maps share single BTree node,
//        // this does not happen on large maps with sufficient number of BTree nodes.
//        //#z
//    }
//}
